problem related to engine temp, help needed Options

[Needles]

hi,

i have a problem whit my third gen 3sgte,
no pressure in the rad after driving, water almost cold

the engine temp will get to normal temperature if i let the car running whitout driving it,
but soon as i get in the road, the engine indicated the temp going cold,
if i go on the highway, it take 2 minute and , the temp going to cold and water indicate no temp at all,

so if i check the engine, the radiator stop receive water from the engine when i accelerating or just iddle on highway,
and temp going all down, and the heater stop working (no heat inside )

i just removed the thermostat, but the problem persist,

on the highway, i stop at a gas station and let the car running, and it immediatly getting heat into the radiator and the temp gauge and water gauge going up,

the water stop going in the engine from the rad when driving !!
plz help me

This post has been edited by Needles: Mar 10, 2012 - 2:33 PM

[richee3]

I'd guess your thermostat was stuck open, which is why removing it made no difference. The coolant is always flowing through the radiator, not allowing the engine to warm it properly.

[Galcobar]

Temperature sits at normal when the car is sitting still, and goes down when driving?

Exactly the symptoms of a thermostat stuck open. The problem is, as richee3 said, that the coolant keeps circulating even when it's too cold. The temperature gauge reads the temperature on the engine. The problem is that the wind from driving cools the radiator, which then sends cold coolant into the engine (why your temperature gauge goes down) and into the heater core (why your cabin heat goes down).

You can test your thermostat in a pot of water on the stove. Put the thermostat in the water, and bring it up to 82C. The thermostat should then open. My guess is that either it's stuck open, or it's opening at too low a temperature.

When you replace the thermostat, remember to get a new thermostat gasket as well.

[Needles]

Temperature sits at normal when the car is sitting still, and goes down when driving?

Exactly the symptoms of a thermostat stuck open. The problem is, as richee3 said, that the coolant keeps circulating even when it's too cold. The temperature gauge reads the temperature on the engine. The problem is that the wind from driving cools the radiator, which then sends cold coolant into the engine (why your temperature gauge goes down) and into the heater core (why your cabin heat goes down).

You can test your thermostat in a pot of water on the stove. Put the thermostat in the water, and bring it up to 82C. The thermostat should then open. My guess is that either it's stuck open, or it's opening at too low a temperature.

When you replace the thermostat, remember to get a new thermostat gasket as well.

thanks for reply,

the thermosthat was moving bad itself, when about to close, it slide on the side , and stay open (the inside part of thermosthat is loose)
i will just get a new one